Have you seen this thread, in particular the comments by @eschwellinger regarding the configuration of the drive's position data format?
SoftMotion always expects the physical drive to be configured with "Absolute" position data format. If the corresponding SoftMotion axis is configured as "Modulo", the rollover behaviour is handled internally by SoftMotion. See also the comments regarding the proper configuration of the Maximum travel range (S-0-0278). My guess is that this is your issue.
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