When I want to display a particular view in a web part in a sharepoint
web site, I choose "modify shared web part" which opens(redirects to) a
new window which provided me with list of views to choose from.

The problem is, I am not able to see all the views that I have created
in the library. The number of view displayed in the "<current view>"
dropdown also varies from page to page.

I am encountering this kind of problem for the first time. If anyone is
familiar with this kind of situation, I will appreciate if you can
provide a solution.