How to reduce or prevent duplicated URLs?

There is a few ways to resolve this issue:

1. After the duplicated URLs are generated you can set one of them as Used in MijoSEF=>SEF URLs page to choose, what URL you want to use for given SEF URL (in case you want to use just 1 URL always); If you would like to use both, you will need to change one of the SEF links to something else, so the 2 are not conflicting.

2. You can also prevent such "duplicates" creating by changing the Record duplicated URLs option to No in MijoSEF=>Configuration=>URLs or MijoSEF=>Extension=>Proper Extension parameters. Then only 1 version of SEF URL will be stored - and in case it is not the one you want - you will need to update it manually.

3. You can also prevent such "duplicates" creating by changing the Numeral duplicated URLs option to Yes in  MijoSEF=>Configuration=>URLs or MijoSEF=>Extension=>Proper Extension parameters. Then an unique SEF URL will be created for each URL.

4. Another option would be to update your site in a way, that there do not exist links with both types of URL. Then no duplicate URL can occur. The most common reason of duplicates is the ItemID issue, check the following link to learn more about ItemID, click here for more info.