Diablo immortal legendary gem issue

Hi, not sure if this is the right spot to write this, but today I found my void spark dormant for some reason, I’m sure I didn’t extract the gem power myself anyway. In fact, it was partially exctracted… to be brief: I could extract it ‘again’ for 715 gem power, but had to spend 850 gem power to reactivate it (it’s a grade 6 gem). So, where did the missing 135 gem power go?