[BUG] Some sprite files with the wrong format

[bass44]

While looking through the 8bdm pk3 for sprite file names, I noticed that there are a few odd sprites labeled "Graphic (SRB2)" and are shown in a pixelated mess in the preview image. Are these sprites corrupted in-game or is it nothing to worry about?

All sprites I found with the format issue were in the "actors" section of the sprites.
SABOB4B6.png
BRBRD5.png
BRNFF0.png
TYREA4A6.png
GYOTC4C6.png
GYOTA2A8.png
SHPLE6E4.png
SHPLE2E8.png
ANKOG3G7.png
ANKOE2E8.png
ANKOG3G7.png
ANKOE2E8.png
METFB7B3.png
METFA1.png

EDIT: Found more in OilMan skin folder:
NOILC8C2.png
NOILD7D3.png
NOILE8E2.png

Also something else of interest; these three sprites in the "lump" format, is this an error too?
CBTPC0.lmp
CBTPB0.lmp
CBTPA0.lmp