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This could be caused by the following factors:

1. Volume scaling differences in the Subscription Strategy. For instance, Follower A may be set to Autoscale, while Follower B is Fixed.

2. Different ratio multipliers in the Subscription Strategy. For example, if both A and B use Autoscale, but A has a ratio multiplier of 1 and B has 2, then B will replicate twice the volume of the Provider's trades.

3. Variations in selected strategies under the Provider filters, such as limits on maximum or minimum lot size, copying only buy or sell orders, and other similar settings.