Welcome to the Q&A Forum

Thanks, Andrew - but I must admit, i'm totally confused as to what I use and where! Presuming I want to show in local near me searches for 1 service, do I need to add each address to the service web page in question?

Looks like everything has now updated! - Sorry for the delay!

I agree with Steve that there is a lot of flux in SEMrush lately.   My take on much of the flux is below..... SEMrush Position tracking is showing a lot of false flux lately for a couple of reasons. 1)  They don't identify your position in the SERPs and report it as "not in top 100".  If you click to see the cache that they used to obtain the rankings your domain is there. 2)  Google has been inserting and removing a link to the image results at the top of many SERPs.   "Images for [your query]"   When present, SEMrush is counting this link to the image results as position #1 and the result is all results below are pushed down one position.  When not present, all of the results below move up one position.  You don't notice this very much in your visibility score if you are on the second page.  However, if you have keywords that rank in the top three or four it can make a huge change in your visibility score. And...   Google does seem to be experimenting a bit and even losing track of a few pages for the keywords that they typically rank for.   So, yes there is a little more flux in Google, but the number changes in many of the tools are a result of contaminated data and bad data collection.

Thanks, Donna. My plan is to not have a knee-jerk reaction to this, and as you say, just see how things play out over the next week or so. Many thanks for your response - I really appreciate it.