You haven't put any EVs into the stat calculator. When you don't put EVs into the calculator, it just assumes all the EVs are 0, and then uses that as its frame of reference for what is possible and impossible.
Clearly, your Gardevoir does have EVs, so the calculator's assumption is wrong and it gives some results that look concerning. For your peace of mind, here is the legal range for each of Gardevoir's stats at level 63, with any EVs and IVs:
- HP: 158 to 217
- Atk: 77 to 131
- Def: 86 to 146
- SpA: 162 to 221
- SpD: 163 to 229
- Spe: 105 to 165
Note that this is not really a fault of the calculator, because as basic algebra dictates, you cannot find Gardevoir's IVs if you don't know its EVs first. So the calculator doesn't care about covering that scenario.