Looking at your 'profile' I see you are a TA, so I guess you are used to some children doing that when they first learn to write. Usually, of course, it is b,d,p,q, 6, 9 as they are all 'a circle and a stick' to some extent.
If it extends to other letters it could be more of a problem. I have my own theory that children see letters just as shapes, until they are more experienced, and as with a circle or a square, its position and orientation makes no difference to its shape. I speculate that letters may be the same for some children. I was a TA / helper for twenty years; for letters b, d, p, and q I used to tell Yr 2 the correct terminology of 'ascenders and descenders' for the 'stick', and they enjoyed that because I said some adults didn't know it!
Incidentally, many of the technical terms used in computing regarding fonts, text spacing, and other aspects of text, come from the hundreds-of-years-old traditions of type setting, and it has an interesting history.
Regarding dyslexia, I'm not qualified to comment; it is a shame though that so many parents, even trained and knowledgeable ones such as yourself, fear 'the worst' as soon as their child isn't matching the performance of their peers.