I tested this myself and it is working as expected so either I have done something different than you that is causing it not to work or you have an incorrect setting.
As a first step, please create a chart with only a weekly series on it, apply the 200 EMA, does it plot the correct value?
If yes, add a Daily series onto this same chart, now edit the EMA and change Panel to the same Panel # as the daily series. Plotting the correct value?
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