First of all, please be aware that I have not, as yet, personally attended to this task,
and the advice provided below is based on information contained in the Service Manual
along with my own judgements.
Looking at the Photo's ...
It can clearly be seen that the mark on the left cam is way out of alignment
with the mark of the cam on the right - It looks like it is
at least one tooth out,
and possibly a little more.
The second Photo is similar, except that the mark on the right hand cam
is not horizontal, making it
look as though the two marks are more
in alignment when they aren't.
The left sprocket bolts are not central in the elongated slots.
( Which they may not be when correctly adjusted ).
I think your problem is that the Cams were not in the correct position,
with the two marks horizontal, and engine locked with the Crankshaft Timing Pin,
and both sprockets having their bolts located centrally within the elongated holes,
when the Chain was refitted and Tension applied via the Tensioner.
My advise would be to start over - Following the instructions in the Service Manual.
Lock the Crankshaft, and ensure the two Camshaft marks are completely horizontal and in line,
adjusting the position of the chain on the sprocket(s) if necessary, and then making
the fine adjustments of rotating the sprockets within their elongated holes to ensure
those marks are correcctly lined up. With everything tightened back up and the Tensioner
applying tension, rotate the engine at least 4 times to make sure the marks still line up perfectly.
The use of Service Tool T3880607 ( Camshaft Timing Tensioner )
is specified in conjunction with Service Tool T3880609 ( Torque Limiter ) to set the
correct tension of the chain when adjusting the Camshaft Timing.
If the upper "Camshaft Ladder" has been removed, Service Tool T3880640 ( Camshaft Timing Plate )
is also needed to ensure it is replaced in the correct position.
Timing Chain stretch is a possibility, though I think this unlikely.
It can be checked by removing the chain, suspending it from a suitable hook,
hanging a 13 Kg weight on it, and measuring across 23 links of the chain
for a maximum permitted length of 150.14mm ( Service Manual Chapter 3 Page 20 ).
I presume you have a Service Manual - if not, let me know and I can provide further information.
Cheers

