mega evolution bug?

When Dramsama mega evolves, her spa goes down. Specifically from 134 to 113. Any reason for that or does mega evolution not carry EV's over?

That's probably just a bug. The EVs carry over to mega evolution for sure. Additionally, according to the wiki (which could be wrong) Dramsama goes from base 105 spa to 125 spa when it megas.

Assuming that all of the stats on the wiki are correct, perhaps it happens because in the current version the only way to get Mega Dramsama is by getting the stone from the 7th gym leader. Since that is the case, it's possible that Mega Dramsama was not implemented properly and got looked over on accident.

Dawwwww