How do I debug an ALV that was processed in the background?

I person customized programme that tin make an ALV successful foreground. It tin besides make an ALV successful inheritance that tin viewed successful SM37.

I person an contented with the file optimization erstwhile the ALV is processed oregon viewed successful SM37.

As seen successful the representation below, the file "Description" is not aligned from apical to bottom. 

Is the customized programme besides liable for the operation of the ALV successful SM37? While the ALV columns does not person problems erstwhile processed successful foreground, I person debugged it and to conception the ALV successful foreground, it uses the FM REUSE_ALV_BLOCK_LIST_APPEND.