If you’ve been eating at a calorie deficit for awhile or have done so in the past, your body may have lowered your metabolism in response. https://www.thefastingmethod.com/blog/2021/11/22/weight-loss-hormones-vs-calorie-counting-In Fast, Feast, Repeat Gin Stephens advocates against calorie counting unless you are doing 5:2 and then only count on the down days.
If you’re stressing yourself about eating right you could have a release of cortisol (hormone that promotes weight gain).
What meals do you consider “healthy?” Those could have caused bloating, may have been too high of carbs, etc. if you’re female your time of the month may vary your weight loss a bit as well.