The larger area area looks like a fill polyline that did not fill ? - not a short, but certainly ‘strange’
The smaller red area is unusual routing, also not a short, but also ‘strange’.
There are many other ‘strange’ areas where it looks like your GND fill polygon was made complex, to almost, but not quite follow the traces.
You may also have the GND fill-PAD clearance much larger than the trace-pad, which means the fill rule reaches past the trace and pushes the fill area on the other side of the trace away - gives a small void.
Usually, you keep the fill outlines simpler, and just use the clearance rules to pull back from traces.
There are a couple of places where I am doing something unusual: I added redundant tracks in an attempt to anchor some pads, because I’d had trouble with them delaminating in an earlier version.
Use larger pads, or a pour area, or use a temperature controlled iron, & more care …