Thank you for the suggestion I'm pretty sure my local gun store carries this

I use Napiers of London a lot. Those Purdey people use it and you can douse the parts in it, it will then blow mostly off with a can of compressed air and it's THIN. Buy a large and small can and refill the smaller can with the bigger one. It never gums up. I won't use CLP because it's too damn thick. But when it comes to oil Steven don't overthink this, it's just oil, not magic fairy dust. Everything on the market works but some are a bit more specialized.

Just my take on your gun. Parker ejectors use a v-type flat spring not a coil spring and such springs typically don’t get “weak”.

I really doubt any amount of cleaning with this or that solvent or oil will resolve the problem.

Are you sure the left fired shell isn’t hitting the breech face (ejecting too early)? Try ejecting a shell by opening the gun VERY slowly. Even then the fired shell should clear the top of the breech

That is what I was thinking Frank. The situation could be a timing issue.

Also, you have to look at the hulls sometimes. I personally have had issues with RST hulls not ejecting well, especially when they have been reloaded.

Ill try that im quite sure the barrels where fully opened because the right side flew out.

Could be a timing issue how are ejectors timed?

Also the shells were winchester super x 2 3/4

Each ejector is timed individually. If that left barrel ejector fires just a few degrees of arc early the rim of the shell could hit the very top of the breech and pop back toward the chamber. Meanwhile the right barrel with ejector in time ejects the shell properly.

Timing of the ejectors is not for those without very deep experience AND with available parts. You can try the solvent, again I doubt it will work, and if the problem persists it will take an expert to fix it. As posted here earlier many otherwise excellent 'smiths decline to work on Parker ejectors. Sorry I don't have any suggestions.

Here's what can happen to a Parker ejector "Floating sear". The center hole is worn oblong, the sear is cracked and there should be a small notch at the crack area that's now worn down but originally like the one opposite it.
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Ill try solvent first if the problem persists ill load it up and take it to Darlington gun works they are only about 2 and half hours from me. I talked to them on the phone they said they would do it but they were 4 to 6 weeks out. Thank you for your suggestion and the photo as well

4 to 6 weeks out isn't a long time. I have a gun at Eyster since January, and he said he'd get to it right away, and I should get it before bird season...in 2027. I still can't tell if he was joking or not. From my point of view this is another reason to have ten to twelve good backup guns : )