I noticed it several times that there are more results for certain searches on careers when I do the search from behind a proxy (England) than from home (Hungary) Eg I searched python + remote only and there were 25 more results with an IP from England. Why?
That's because we geotarget listings based on your IP address. We basically target 4 tiers of X miles based on the amount of impressions a listing is getting. The less impressions, the farther out we go geographically. From what you describe, it's working as designed.
Another reason is that employers can opt in to target certain regions only. I.E. If a customer selects North America, an IP address outside of North America will not see their listing in search results.