Export Audio Mixdown not following Arranger Track

Good Day Folks.

I have this track which plays perfectly on Playback, ie it follows the Arrranger Track I’ve programmed.

On Export Audio Mixdown following the Arranger Track is hit and miss. It’s a bit better doing a Real Time Export but not much.

The only way I could successfully do the Export was to first Flatten the Arranger Chain.

Is this normal ??

Thanks in advance.