Can a repaired Leica flash damage a camera?

[SOHODE]

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I just received a used SF24D flash that I purchased from FredMiranda website. The flash looks clean but I realized there were signs of disassembly on the body and the screw. The signs are in a way that I don't think Leica or other authorized places have done the repair. I asked the seller and he says he wasn't aware of it since he wasn't the first owner. I tried the flash on my m10 and it looks like it is working without issue. After that I read on some other topics people were talking about how a faulty flash (with high voltage) can damage a camera. I'm kinda afraid now. Do you think the flash might have a voltage change after a repair? Is there any way I can make sure the flash is safe to use on my camera? As I mentioned I already took 20-30 pictures with the flash.

The other thing is in the TTL mode the flash fires twice ONLY on some of the shots and for the other shots it fires only once. Is this normal? (this is my first SF24D flash)

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Edited December 6, 2022 by SOHODE

[SOHODE]

Update: In the TTL mode the pre-flash works in all the shots it's just faster sometimes and I didn't realized.