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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Conditional formatting changes format of dates and numbers"
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=108373#c3">Comment # 3</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Conditional formatting changes format of dates and numbers"
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=108373">bug 108373</a>
              from <span class="vcard"><a class="email" href="mailto:xv3247@gmail.com" title="Xavier Van Wijmeersch <xv3247@gmail.com>"> <span class="fn">Xavier Van Wijmeersch</span></a>
</span></b>
        <pre>Created <span class=""><a href="http://bugs.documentfoundation.org/attachment.cgi?id=133899" name="attach_133899" title="changing column B to C">attachment 133899</a> <a href="http://bugs.documentfoundation.org/attachment.cgi?id=133899&action=edit" title="changing column B to C">[details]</a></span>
changing column B to C

I confirm the behavior with conditional formatting3 
but changing column B to C then there is a normal result see attachment

Version: 5.5.0.0.alpha0+
Build ID: ddf8539d97ce044b7df8d51d6ec72ec864b40fb8
CPU threads: 2; OS: Linux 4.9; UI render: default; VCL: kde4; 
TinderBox: Linux-rpm_deb-x86@71-TDF, Branch:master, Time: 2017-06-04_22:00:43
Locale: nl-BE (en_US.UTF-8); Calc: group</pre>
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