On "view_all_bug_page.php" (All Projects) there are listed the Categories of each issue together with clickable links of the project´s name. Pressing this link I would expect that I am somehow taken to the project (e.g. switching the "Current Project"), but what happens is that Sorting changes to "project_id Descending" (there also seems to lack some translation, because it should probably be "Project Id Descending").

Perhaps this is regarded as a feature, because there is no other possibility to sort by project_id (Clicking on "Sort by:" this is not listed), but I would suggest to make the project name plain text (not a clickable link) and add project_id to the list of possible sorting criteria.