Without being able to see your actual numbers (screen shots are OK, but to really troubleshoot attaching the .bsmx file helps greatly), there is one thing that stands out up front.
If your normally getting a brew house efficiency (BHE) of 70% with a 5 gallon batch and have the same trub loss of 1.3 gallons at the end of the process, then your process losses as you go down in volume become much greater of a percentage of the sugars. With a target of 5 gallons going into the fermenter and a loss of 1.3 gallons between end of the boil and the fermenter, then your percentage loss is 1.3 gal / (1.3 gal + 5 gal) = 20.6%. Indicating a mash/extraction efficiency of around 70% + 20.6% = 90.6% which is quite high to begin with.
Now you drop your ending volume in the fermenter to 2.5 gal and have the same 1.3 gal process loss, your loss in sugars is 1.3 / (1.3 + 2.5) = 34.2%. You dropped your BHE to 65% so you have forced the software to a mash/extraction efficiency of around 65% + 34.2% = 99.2%, even higher.
When I make a process change of that magnitude, I usually drop my BHE appropriately to keep my mash efficiency close to the same value as I would have achieved in the original batch size. With your apparent numbers, I would have reduced my BHE by the difference in the process losses: 34.2 - 20.6 = 13.6%. My initial target for BHE would have then been 70% - 13.6% - 56.4% as a starting point and modified it based upon the results of my actual brew for the next time.
Which brings up another point, I noticed in your screenshot of volumes that you did not enter in the actual measured values. If you enter in your actual measured values for volumes and gravity into the 'session' tab, then the program will calculate out your actual mash efficiency and BHE on the sessions tab to help you troubleshoot your issues.