I found in HTML Improvements section google search console about 1200 duplicate meta title, then I checked one of them for example Tehran to Qeshm flights:
In fact, the main URL for the page is:
/flights/THR-GSM, but when users search in search box for a specific date, child and adult or other parameters, they would include in URLs as you see above. It appears that Google sees them as different pages and lists them in "duplicate meta titles" section.
Why does this happen? Why are they are shown as separate and different pages?
Should I use canonical tags for this issue?