I have "Safe search" set to "On" and, when I go to your photostream, the header says that you have 904 photos, and the last photo in your stream is www.flickr.com/photos/pasa/49795373027/in/dateposted/, "Pair of Pidgeons", uploaded on 19 April 2020. However, if I got to that photo's page, the context strip under the photo enables me to scroll through many earlier photos and I can open, for example, www.flickr.com/photos/pasa/49775391646/in/photostream/, "Police line", uploaded 7 April 2020. If I then click "Back to photostream" I get taken to the start of your stream, not to the context of "Police line". This is a problem that has occurred before, I believe, and I think that, if you contact staff via help.flickr.com/contact (assuming a staff member doesn't respond in this thread), it should be possible to fix the problem for your photostream, although it looks as if a global fix has yet to be found!
If I change my "Safe search" setting to "Off" and go to your photostream, I get 87,873 photos over 879 pages, as described by ernstkers and mcnod. So the manifestation of the bug seems to depend on my "Safe search" setting; it may be that theirs is different from my normal setting of "On", which may explain why we are seeing different things.
Posted 8 days ago.