The filter doesn't read all products
Problem: the price slider filter counts only the visible products on the page or the filter doesn't read all products
In fact that, the price slider shows only the min and max of the showing products, not all product in a category.
But for example, If you have 2000 products and you need to show only 20 products per page. We regret that now we have not had a solution for this, it is in library.
However, we can only suggestion that if possible, please use normal filter, we mean without slider.
You can go to admin STORES -> Configuartion -> Ajax Layernavigation [ MGS ] then disable the price slider.