The Opamp is latched up because you have positive fdbk around it.
Eliminate the fdbk path from NI to Output of ther OpAmp, double click
it, set it to a follower. Run TIA output into NI input of follower. But TIA
is itself buffered, you should not need a OpAmp follower.
If you need to invert the TIA output then use a PGA as an inv amp.
Or reverse TIA input current.
Used Inverting PGA , this having Maximum OFFSet, which is killing the real signal
What is the input to the TIA ? Schematic if you have one.
If you are facing Offset issue, try adding a DAC to compensate it.
The DAC brings its own set of offset and gain problems with it,
do an end to end error analysis to see how this substantively this
will not work.
A classic method of getting rid of offset is to use a S/H to capture the
offset, and subtract it out.
Another very effective method is correlated double sampling -