I had a player of mine make a lvl 1 Sorc. and lvl 4 druid. I noticed on the character sheet that level 3 spells were available. Correct me if I am wrong but this is only available to level 5 druids. This is what I see in the "spells" section of the character in dndbeyond:

• 1st lvl spell slots - 4 available
• 2nd lvl spell slots - 3 available
• 3rd lvl spell slots - 2 available

In the 3rd slot, I do see spells have the "level 1" casting to them so I am assuming these are 2 spell slots given by the Sorcerer class but only labeled at level 3. I recreated the problem twice and confirmed it is a bug. I believe my player had at least 1 level 3 spell selected but now I cannot confirm that and it will not allow level 3 spells to be chosen. Is this a bug or is this desired to separate the spell slots of the druid from that of the sorcerer?

Quote from Sampsomonium >>

I had a player of mine make a lvl 1 Sorc. and lvl 4 druid. I noticed on the character sheet that level 3 spells were available. Correct me if I am wrong but this is only available to level 5 druids. This is what I see in the "spells" section of the character in dndbeyond:

• 1st lvl spell slots - 4 available
• 2nd lvl spell slots - 3 available
• 3rd lvl spell slots - 2 available

In the 3rd slot, I do see spells have the "level 1" casting to them so I am assuming these are 2 spell slots given by the Sorcerer class but only labeled at level 3. I recreated the problem twice and confirmed it is a bug. I believe my player had at least 1 level 3 spell selected but now I cannot confirm that and it will not allow level 3 spells to be chosen. Is this a bug or is this desired to separate the spell slots of the druid from that of the sorcerer?

This is the correct number of spell slots for the character you've created. It is not a bug; it is exactly how multiclassing is supposed to work with multiple spellcaster class.

When you have multiple classes with full Spellcasting like this, you get a combined pool of spell slots equal to those you would have if you were a single-class caster of the same total level. In your case, you have the same spell slots as a level 5 single-class spellcaster. These spell slots are not "given" by one class or the other; you can use all of them to cast any of the spells from either class of the appropriate level.

However, the list of spells you prepare for each class is based on how many spells you would have if you were a single-class caster of just that class level. So, you prepare your Sorcerer spells as if you were just a level 1 Sorcerer with nothing else, and you prepare your Druid spells as if you were just a level 4 Druid and nothing else. This is why you're not able to prepare any level 3 spells, because as you say, that would require having 5 levels in one class or the other.

All of this, including this edge case where you have spell slots for spell levels you can't prepare spells for, is spelled out in detail in the Multiclassing section of the Player's Handbook.

I get it. So this is as intended. I thank you for your information and just question the reality the programmers of the system live in. :)

Personally, I think it is slightly misleading and I would wonder why they would not label it as Druid 1st level spell slots or Wizard 3rd level spell slots instead of arbitrarily counting upward. As a DM, I try to talk my players out of multiclassing to avoid some of these confusions but I will never take away their ability to choose. 

Quote from Sampsomonium >>

I get it. So this is as intended. I thank you for your information and just question the reality the programmers of the system live in. :)

Personally, I think it is slightly misleading and I would wonder why they would not label it as Druid 1st level spell slots or Wizard 3rd level spell slots instead of arbitrarily counting upward. As a DM, I try to talk my players out of multiclassing to avoid some of these confusions but I will never take away their ability to choose. 

To be clear, the whole idea is that the spell slots don't come from a specific class, so they don't need to be labeled that way. Having to keep track of which spell slots came from which class, and which spells could be used with which spell slots, would be a lot more complicated for the player. In order to avoid multiclass characters having an enormous number of spell slots, there would have to be some entirely different algorithm for how your spell slots progressed each level that depended on what other classes you had any how many levels you had in them. This way is a lot simpler both during the process of creating and leveling up the character, and during actual play.