Laundry Detergent Staining Light Colored Clothes

What about it?

WHY and HOW do my light colored tshirts and pants keep getting laundry detergent stains after washing??! Some clothes I have tried to wash alone in water again and didn’t come off. What can I do?! I have a pair of cream colored pants that are COMPLETELY ruined and have blue streaks of detergent all over them. I use Gain liquid detergent. I have always poured it over clothes and washed my clothes the same way but they have been staining my clothes the past couple months.

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