What's going on with strikethroughs?

[MipMipMip]

My strilethrough (or deletes as it's called on the drop down) are no longer working. Anyone else with this problem?

An example here. www.mumsnet.com/Talk/womens_rights/3255656-Feminist-Music-lets-make-the-best-Spotify-playlist-ever?watched=1&msgid=78057796#78057796

Someone very kindly posted these instructions a while ago. For iPhone or iPad. Don't know whether it works for you?

two of these -> - - with no space apart, touching the word. like this ?

Unless mine have stopped working too

That's what I'm doing. But not working. 《wails loudly quietly》

And now it works....