If somebody has replaced a light bulb on the rear brakes or front parking light, may have the wrong light bulb and back feed to the parking lights. Not enough info. sorry.
Your relay is sticking or your parking light switch is bad
Put the switch all the way to the zero...
Are all parking lights on or just front daytime running lights only? Either case sounds like a light control module in your fuse panel stuck.
SOURCE: 2000 Silverado daytime running lights don't work. bulbs new.
Not saying that you don't know this but the daytime lights are turned off in park.
If that is not your problem, a friend of mine uses the amber bulbs, they last longer.
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