Using mc-4.8.19-5.fc26.x86_64, but I noticed it earlier too. I use midnight to unpack files, explore content of rpm packages and so on. Steps like the below lead to confusion:

a) open midnight commander and go to /tmp
b) download any rpm file and name it a.rpm [1]
c) in midnight, select the a.rpm and press Enter
d) then select CONTENTS.cpio file and press Enter
e) now you see what the package contains/will install
f) download a very different rpm file and name it a.rpm [2]
g) in midnight, select the a.rpm and press Enter
h) then select CONTENTS.cpio file and press Enter
i) now you see what the package contains/will install, except it's not
   for [2], but still for [1].

When you rename the a.rpm to b.rpm, then midnight will show the correct content (unless you already had opened the b.rpm in it).

[1] wget -O a.rpm https://kojipkgs.fedoraproject.org//packages/evolution/3.27.2/1.fc28/x86_64/evolution-bogofilter-3.27.2-1.fc28.x86_64.rpm
    Which installs into /usr/lib64/evolution/modules/module-bogofilter.so
[2] wget -O a.rpm https://kojipkgs.fedoraproject.org//packages/evolution/3.27.2/1.fc28/x86_64/evolution-pst-3.27.2-1.fc28.x86_64.rpm
    Which installs into /usr/lib64/evolution/plugins/....