To my eye, those look like internal reflections of light sources in frame.

This is an unavoidable consequence of mult-element lenses and bright light sources; at every air-glass, glass-air, or glass-glass transition, there will be a low percentage of light reflected rather than transmitted (1% or less with a modern lens coating), which can then rereflect from another interface to find its way back to the sensor/film and be detected. The low percentage prevents large overall contrast loss (which was the original reason to start coating lenses and the discovery of coating effects), but can't completely eliminate recorded reflections of light sources much brighter than the overall correctly exposed frame.

In your case, there's a significant halo around each reflection, and only a single visible reflection of each source, suggesting (as one comment on the question asked) that you have a filter mounted and that the filter is either poorly coated or has a surface haze. Your question says you don't have a filter mounted for these frames, but many camera sensors have a built-in infrared-blocking filter layer (required due to the high IR sensitivity of most silicon digital sensors) and surface contamination of that filter layer could produce the halo effect from reflections inside a clean lens. Otherwise, these halos may indicate a film (lubricant from aperture blades or zoom mechanism, perhaps) on the internal lens surface that's producing these primary reflections.