In CentOS 7.6 + Apache httpd-2.4.6 + ELOG V3.1.4 environment with Reverse Proxy setting of

/etc/httpd/conf/httpd.conf
 :
ProxyRequests Off
RedirectMatch ^/elog$ /elog/
<Location /elog/>
ProxyPass                      http://mmm.riken.jp:3333/ 
ProxyPassReverse         http://mmm.riken.jp:3333/
ProxyPassReverseCookiePath   /      /elog/
</Location>
:
It almost works fine.  But Changing password has problem. 

When clicking the "Forget password?" link in login window and displaying "Entering your user name or email address"
and entering it, an email is sent to the user:

----
This is an automatically generated account recovery email for host mmmm.riken.jp.
Please click on following link to recover your account:

http://mmm.riken.jp/elog/?redir=%3Fcmd%3DChange+password%26oldpwd%3DIHCPHXNTMJGEYDKY&uname=test&upassword=IHCPHXNTMJGEYDKY

ELOG Version 3.1.4
---

Clicking the URL above in the Firefox Browser results invalid URL: 

http://mmm.riken.jp/?cmd=Change%20password&oldpwd=IHCPHXNTMJGEYDKY

These parameters does not pass to the elog by the Reverse Proxy setting above.

 While accessing the URL of (native elog port: 3333)

http://mmm.riken.jp:3333/?cmd=Change%20password&oldpwd=IHCPHXNTMJGEYDKY

displays the normal page for Changing password windows for the user.

Is there any suggestions for the Reverse Proxy setting in Apache httpd 2.4 
so that the changing password windows works fine ?

Thank you for any suggestions.