those in pink/purple color on the image as you are using accent in the o's `ó` then mastodon converts them into link into your fedi instance, rether than just accepting not everyone is interesting in using mastodon, but alot of users prefer other releases like #sharkey or #akkoma
I have a couple of users who have commented negatively on this, but i can only beg and encourage the sender to consider using all ACSII or as regex `[a-zA-Z0-9]`
