I have updated to 4.5.2 SP2 and am having this problem also.
Look at the screenshots attached. The invoice totals are correct in both cases, but the cost of shipping is showing incorrectly (in one case the shipping should be $1.61 instead of $1.00 and in the other case the shipping should be $2.63 instead of $2.00.
Hope this gets fixed soon.
[attachment=12317:Screen Shot 2017-04-22 at 2.08.30 PM.png]
[attachment=12318:Screen Shot 2017-04-22 at 2.08.45 PM.png]