No space after period and comma

Hello, I have a problem when I'm bulk generating atricles. After I check generated articles, all of them have parts where there is no space after periods and commas. For example: "Observe how your body reacts and gradually increase the amount.In order to maintain a variety of flavors and optimal absorption of nutrients,it is important to combine them with other foods." it's not the whole text like this, but there is like 5 -10 sentences like this. How do I fix this? I tried to add something like "Always use space after period and comma" in promts, but it didn't help.