When I try to craft the same type of item multiple time in a row the crafting bug out and will use the mats and credits but not craft the item. The only way to fix it is to exit and restart the game.
We are currently analyzing these issues as recently the problem reappeared and with higher frequency. We will try to handle the problem as soon as possible. Until then please let me know if you lost materials and did not get them back when you restarted the game.