Imgur blocks access to most VPN IP addresses so any posts using the host will result in many users being unable to see the content. Sometimes only remote viewing is affected but is also often blocked when trying to open in new tab and view at the parent site.
Consider uploading to the fediverse or using a privacy-respecting hosting service like postimages.
Also, anyone in the UK not using a VPN won’t be able to see them, since imgur chose to block the UK rather than adhere to age verification laws.
Whatever one thinks about that legislation, other countries (including the whole of the EU and Australia) are likely to do the same and it seems likely imgur will become a US-only resource…