Is it after eating on your feed day? It may be that you’re eating too early (ie not actually hungry yet), too much or something which is too rich/heavy for your tummy after eating lightly the day before. I soon learned to change my breakfast habits following my fasts!

Sumitra, symba7 is correct, you need more protein on your fast day. If you click on faq tag on top right of home page and check out what foods should you eat, you will see a comment regarding protein. If you are not a meat eater on fast days consider Quinoa in your diet. It is high in protein.
By the way, just a suggestion, try your eggs poached instead of fried, it may help settle any tummy upsets.
Good Luck.

I had the same problem,
I only need to eat around 200 cals on a fast day, (yes it’s working fine) if I eat too much in one go the next day, not just for breakfast I get very loose, I’ve tried eating up to the max with more protein,
it made it worse! So, as we are all different, try eating smaller amounts the next day and you may find the runs stop. It’s worth a try as having to be near a facility all day isn’t much fun. Oh, the other thing, egg yolk can cause bowel irritation in some people if not eaten with non absorbent foods, like bread. Avoid bread on a fast day for obvious reasons, try eating lean ham instead of the egg.
This is only a suggestion as it works for me, it may not help you at all, but it’s worth trying.

You may find your insides settle down and get used to the fasting on their own and the runs will stop As I said, we’re all different.