Not affecting me in Chrome; was good earlier and just battled again with no problem. Yikes; I hope that gets sorted out for you!
They came back, luckily! BUT I only got 3 wraith bloods after battling on hard like 15 times. Is that normal? Also, the bd is super slow for me, and has given me a couple of error messages. I had to buy the other three wraith bloods to finish up the potion making in a timely manner.
EDIT: I use chrome as well. I wish I knew what was wrong with it for me.