May well be a WAD error.  May well be a repeat of something similar already reported.
Because you mentioned Project Slipgate over at Zdoom, I decided to play it again.  On completion, at the cast call screen I noticed the BOSSBACK graphic was odd.  There was a strip down the left of the screen that still showed the intermission text from the previous screen.  On inspection of the WAD I noticed the graphic is only 256 wide.  So, I don't know what should happen, but I thought it was worth reporting.
			
			
									
						
										
						[won't fix]Project Slipgate BOSSBACK
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				Enjay  
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