Eikka, if it looks suspicious enough to you that it may be a defect, I would suggest you take it to the place where you bought it and have them inspect it as a starting point.
Good luck.

I send inquiry about defect and Titleist replace my TS4 head - It was broken. Sending a new TS4 head took 5 weeks. I carefully checked new head and it was flawless.

Two times at range and 9 holes then I noticed same problem with new head it was even worse than earlier. So same waiting of 5-6 weeks again.

They meantioned earlier that TS head are really hard to find and thats why sending took so long. They still find somewhere a new TS head.

Now I have tested a new head multiple times and found out that it is really low spin/launch compared my earlier heads. Normal launch was 13-14 degr. and spin 2200-2500 with this new head launch is 8-10 and spin 1400-1800. Everything else (ball, LM setup, shaft, etc.) is same than earlier. Head weight/swing weight are identical to earlier head. Is there so wide manufacturing tolerances or have someone seen earlier that with same model/degree heads have so big difference?

Update to this thread. I got that earlier meantioned third head and after a month of winter training indoor golf hall it develop a similar ridge than earlier two heads. They asked head back to local manufacture representative and after inspection they decided that there is no any defect on that head. Head have a similar ridge than earlier heads and I have pictures when it arrived first time to me. Those pictures dont have that ridge. I asked writen announcement about their comment that head dont have defect because of tournament golf. I have noticed that sometimes that ball comes really hot if the face (+8mph ball speed from normal) but it is ok (as long as head wont crack) for me if manufacturer has said that there is no defect. =)

It is a defect. It also happens to the tsi4 heads. I'm already on my 4th tsi4 head.

I can't seem to post a pic here but If I could I can shoe you how my ts4 head looked after the ridge pops