The humidity reading is too high for normal AC operation. Either the AC is broken (not removing moisture), or some other source is sending excessive water into the interior of the house. Some ideas of things to check...
Verify the temperature and humidity reading with a separate gauge. The Ecobee could be bad. If incorrect, power cycle it and recheck.
Flush the AC drain line. It could be blocked but still flowing a little bit, leaving excessive water to go right back into house. Good PM even if not 100% clogged.
Search for a slightly open window or door allowing outside humid air to get in.
Make sure AC fan is not running constantly.
Make sure all bathroom and stove exhaust fan are off. If running it pulls in outside humid air.
Look for a water leak causing water to be sitting and evaporating. Clothes washer, sinks, toilets, dishwasher, doors, windows, lanai, faucets, AC heat exchanger unit in the garage (or laundry).
Run irrigation zones and look for a geyser shooting water into soffit, forcing water into the attic, then drains onto ceiling. Also look for a head spraying onto windows or walls.
If you have access to a thermal imaging camera, look for issues with wet areas that should be dry.
Make sure toilets and all drains have water in their traps. Beware of a sewer gas smell allowing it, and moisture, easy path into interior.
If you have a thermometer, measure the air temperature from the vents when running. Should be cooling enough to get below the dew point so that moisture condenses (thus lowering the relative humidity). My place controlled to 75 has discharge air at 48 to 52 degrees. RH is 50% to 60%.
Go outside and inspect compressor. Look for all fins to be clean from dirt, fuzz, bugs, insects, pollen. A GENTILE hose spray will wash off lots of gunk. Also away from landscaping blocking air flow. Make sure no plastic bags have been sucked against it. Listen to it start - does the motor zoom right on in less than a second, or are there squeals, multiple start tries, lots of banging, sound like it's struggling to get going, surging, chugging?
Let us know what is found.
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