I'm seeing the same thing.  Also, prior year info is all in quarter 3

I am seeing the same issue, does anyone have a fix for this?

This issue is currently being looked at in R&D. 

Sage 2018 was released almost a year ago, this hasn't been resolved since then?

This is my personal take (not Sage's official position).  Thinking back, I believe I actually noticed this when doing upgrades while in fourth quarter 2017 (my own system, not clients).  It put everything prior to 4th quarter into 3rd quarter and I just chalked it up the conversion program just didn't handle this as it really wasn't available in the old version. I refused to upgrade any clients to the new system that late in the year and that early in the release cycle.  Put it out of my head and then I myself didn't do any client upgrades until about May.

Any conversion in 1st quarter, it just wasn't an issue because everything would go into first quarte where it should be.  Any conversion in second quarter wouldn't have been an issue because everything prior to second quarter would have ended up in first quarter where it should have been also.

Now that we are in third quarter,  it's becoming obvious because first quarter is empty and 2nd quarter has both first and second quarter.

In other words, as more and more people are doing upgrades and we hit third quarter people are just now really noticing it.

In the long run, it would be nice that it converted correctly, but in reality we don't have anything less than if we were still in the 2017 version so I personally have not been overly worried about it.

Clients are upset though and they are asking how Sage could put out software and force clients to upgrade when the software has bugs.  :(  I have been a huge Sage100 cheerleader for 30 years and very defensive about my software!  lol  lately its been hard to defend!  :(

I concur Sage is pushing clients into upgrading too often and especially with this PR being released before it was really ready.  I had Sage calls about this in Q2 and Q3 and got different explanations so I guess the issue was actually identified after that. It seems like Sage should take a little more time with 2018 before pushing 2019 release The 2 year period for retiring products is too much forcing PR users to upgrade when they really don't need or want to. Some users are happy with on premise Sage core software and are not interested in all these new (especially clould) features. Increased Maintenance costs and costly upgrades are not giving customers an exceptional experience.