AC Question: Temp increases when I set the thermostat lower

Noticed this issue yesterday evening when I got home and again today. Got home and the AC was set to 72 and cycling on and off as usual. Decided I wanted it a little cooler so I dropped it to 70. About 30 minutes later I feel the house getting warmer and more humid. Checked the thermostat and it was reading 74.

I pushed the thermostat back up to 74 and the system eventually cycled off. I let it run another cycle at 74 and then after it kicked off, waited about 5 minutes and set it to 73 and then let it run for another couple of cycles. Did the same thing again and now I have it back down to 72.

Filter was changed yesterday and I've checked the pan in the attic and there is zero condensation in it. Went outside and the low pressure line is sweating but does not feel very cold at all. I'm assuming it's low on refrigerant but any other possible suggestions are welcome.

The outside unit has one of those blue filters on one of the lines which tells me a few years before I bought the house, there was a leak and the filter was put on.