Double exposure (IBIS?) when shooting eclipse 7 shot bracket on TV = 1/60s and T=1/10s (EOS R5)

[mems2go]

Double exposure (IBIS?) when shooting eclipse 7 shot bracket on only 2 of 7 images  (TV = 1/60s and TV=1/10s).

Occurred on all bracket shots (over 50 bracketed shots) during eclipse totality 😞

R5 body, RF 100-500 lens, RRS Tripod set at lowest level to ground (very stable)

Firmware on R5 = v2.0

Bracket = 7, 4 stop range, ISO = 200, AV= f11, TV= 1/160s,  

Focus = manual, Image stabilization = off (lens switch)

5 of 7 shots are focused very sharp, but 2 of 7 images appear to be double exposed with slight movement in image (looks like pixel shift shenanigans, but this feature should have been off via camera lens setting)

TV = 1/160s, Bracket = 7, Stops = 4
10  - Double exposure
25
60  - Double exposure
160
400
1000
2500

[mems2go]

This occurred on the same 2-of-7 brackets on over 50X(7-bracket) sequences shot during totality.

Vibration is highly unlikely;  could this be an IBIS malfunction? 

TV = 1/160s, Bracket = 7, Stops = 4

1/10s  - Double exposure 😥

1/25s

1/60s  - Double exposure 😥

1/160s

1/400s

1/1000s

1/2500s

I also shot Diamond Ring with 5 bracket sequence (different TV values from totality bracket) without any double exposure artifacts observed.

[mems2go]

The whole/entire image is double exposed...

Only occurs (repeatedly, over 50 full brackets) for 1/60s and 1/10s in 7 bracket sequence...

So, I had to discard 2 of 7 shots (per bracket, on every bracketed sequence) 

[mems2go]

April 8, 2024 Eclipse (only 5 of 7 shot bracket usable)