Hi marcpurcell,
There is not a strong magnetic “feel” to it. If you have got the right tracker feature [Null] will be shown in the Attribute Manager (Tag is selected), in the Tab Planar. There is a list, and in this list you should find the three Tracker Features [Nulls] that will determine the orientation of the Planar Tag. It is possible to select those manually. However, if placed, the Nulls should find an entry in this list.
Screen shot:
https://www.amazon.com/clouddrive/share/1yUOTnc47eZy6ptQjVyvDf4ks9manXCC2rYZI7Edn0c?ref_=cd_ph_share_link_copy
If nothing happen, please check with the support, and make certain to have the latest R16 version in your case.
https://www.maxon.net/en-us/support/how-can-we-help/
I have used the footage of this tutorial, in R16 and R18 to test it for you and to see if there was a change noticeable for me. Both versions works in this regard identical.
All the best