Two of my portfolio items (SHERF and SPR) are listed in light blue (vs. using the normal dark blue): why?

I'm aware SHERF (a Canadian company, TSE: S) is not easily traded now, as they own some cobalt operations in Cuba, and Trump *apparently* elected to stop its trading on (some?) US exchanges (although I haven't totally run this assessment to ground).  I just also found that SPR is also listed in light blue and it's an American company that should be in good standing on NASDAQ.  I can't seem to find any reason to explain your light blue designation.