No washer at shock to head mount. There should be a washer behind the tensioner Part # 23 based on your style tensioner. From your other thread, you mentioned that the tensioner bolt threads were damaged, any sign of that before installing new?

The backface of the tensioner in your pics shows some scars, not sure how this happened, but that outer face should not be in contact with anything, only the center section where the bolt goes thru and the washer backspaces it from the timing cover.

Possibilities that come to mind:
Tensioner mount washer missing causing alignment issue
Tensioner threads where damaged causing tensioner to mount at an angle, again alignment issue.
Possibly a bad pulley out of alignment elsewhere in the route, water pump, power steering etc.
Possibly locked up AC compressor that when activated caused excessive force on tensioner pulley.

The threads on the timing cover will be the most challenging, if they can be re tapped and cleaned up, would be great. If damaged or if the timing cover mounting boss was stretched/bent, a new front timing cover may be the only solution to that.

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Stable Mates:
1987 300TD 310K mi (Hans)
2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee)