Bug - upgrading empowered gems with maximum hp gives false numbers

I've encountered this on multiple instances, with many separate gems. The pictures located below were all taken on 8/14/16 at about 8:00 P.M. EST. However, I've also encountered this bug about a week before, when the 5$ gem pack was not available, and I was lacking gems to level.

I found this bug while leveling multiple empowered gems of all types (Water, Air, and Fire).

I expected to see normal level stats (Ex. +70 Magic Damage, +1200 Maximum health)

Instead, the Maximum Health stats showed incorrect numbers upon leveling. (See pictures)

To reproduce this bug, get a 3 star stellar empowered gem, make sure one of the stats is +Maximum Health, and on one of the large stat boosts, if Maximum Health gets boosted once, the stats upon leveling get bugged.

I took 3 screenshots of me leveling a stellar empowered gem from level 8 to 9, 9 to 10, and 10 to 11.

EDIT: Could not get pictures to work, so here are the 3 links in order.
Level 8 to 9 - http://imgur.com/XFJQa1U
Level 9 to 10 - http://imgur.com/hTOE9RX
Level 10 to 11 - http://imgur.com/MKXHaNs