Buying Inventory

Devels, answer this for me,

Need help with this one,
yesterday
130 x Foreign Legion Infantryman (2470 Defense)
614 x Swedish Amphibious Corps (11052 Defense)
Total: 14346 defense

today bought 110 Infantry
240 x Foreign Legion Infantryman (4560 Defense)
494 x Swedish Amphibious Corps (8892 Defense)
Total: 14296 defense

How does my total defense go down? If I get rid of 110 Corps at 18 defense and replace with Infantry @ 19 defense, shouldn't I be up 110 points? And how did I lose ten extra Corps.?

Before other people give chime in, there is no other unit that was bought, these are the only two fields that changed.

Hello,
We need to ask you for a bit more details regarding the fight, so please provide us with the entire battle report. We can't pronounce ourselves definitely since the use of your items might be limited based on the other player's level.

Sorry, can't help"chiming in"..I suspect that this was due to number of units used in the particular battle, which is based on their level, and units available, not yours, you switched to a unit they weren't able to access, therefor you don't get to use them...( I love puzzles,lol)
RONIN