When you are in the keyframes window, the filter is applied.
Focus is still on that clip.
When you deselect the filter from that clip, that VUI border goes away.
The filter is selected for the whole clip, although you are trimming most of the filter from the clip.
Just as @Namna showed here, above, we need to see screenshots of the Filters window, @randombluescreen, so that we can know exactly what filters are currently active, and with what settings, in order to help you.
Sorry but i kinda feel like you think im dumb. I literally said 3 times that it was even on the final render but here you go. Unselected but still there.
videosettings are 656 x 160 ratio the same 60 fps changing these doesnt help.
the image is 656 x 160 (with transparent bg if thats important)
the only setting i changed in the SPR filter is the bg color to transparent.
Also this applys to all the images that i use. As soon as i use SPR the bar at the bottom appears.
I can’t reproduce it with the image you posted on a single track. One reason for asking for a screenshot of the whole Shotcut window was to see what sort of timeline / tracks you had and whether you had mistakenly applied a filter to the “Output/Master” track.