3* jewel grinding level12 to 13 not working

by papapou posted Aug 13, 2019
Happened to me at least 3 time. Grindind trian.gle jewel primary stats was attack at +19,jewel level12,grinded succefully at13,primary att +19 turn bleu to level up but didnt change at all,have stay at +19 ,a big waste of ruppe in grinding...
Keep a eye on grinding 3* jewel ,i dont know if it same for 1*,2* or 5* jewel.
Dont know either if it only happenn to tri.angle kind

Together we can build information about this issue and let know visualshower so they can fix it.