Resolution, colour artifacts when using sapphire

Fuzzy resolution or render artifacts visible when using any sapphire effect within premiere pro and after effects, below is an example, the first image has an empty s_effect applied while the second does not.
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this appears in both export and preview, and is as if sapphire is scaling down the footage and then scaling it back up, 1080x1920, happens at 60fps and 30fps and when sequence settings match footage

utilized sapphire for over a year and a half now, never had this issue before

looks slightly better when exporting on 4k, my thought is that sapphire is downscaling the footage by a percentage at some point and then scaling back up.