Apache2 conflict available sites - virtual hosting

I have two websites WebA and WebB. I am trying to serve both of these website in a single virtual machine with a single public IP using apache2 virtual hosting.

Before I write about the problem, here is my apache2 virtual hosting configuration:

WebA.conf:

<VirtualHost *:80>
    ServerName weba.com
    ServerAlias www.weba.com

    Redirect permanent / https://weba.com
</VirtualHost>
<VirtualHost *:443>
    ServerName weba.com
    ServerAlias www.weba.com
    ServerAdmin [email protected]

    DocumentRoot /srv/apps/weba/weba    
    WSGIScriptAlias / "/srv/apps/weba/weba/weba/wsgi.py"

    SSLEngine on
    SSLCertificateFile /srv/certificate/weba.crt
    SSLCertificateKeyFile /srv/certificate/weba.key
    SSLCertificateChainFile /srv/certificate/webac.crt

    ErrorLog /var/log/weba/error.log
    CustomLog /var/log/weba/custom.log combined

    <Directory /srv/apps/weba/>
        AllowOverride None
        Require all granted
    </Directory>    

    <Directory /srv/apps/users/>
        AllowOverride None
        Require all granted
    </Directory>

    Alias /static /srv/apps/weba/weba/static
    <Directory /srv/apps/weba/weba/static>
        AllowOverride None
        Require all granted
    </Directory>

     Alias "/weba/" "/srv/weba/"
    <Directory "/srv/weba">
        AllowOverride None
        Require all granted
    </Directory>

    Alias "/contents/" "/srv/apps/"
    <Directory "/srv/apps">
        AllowOverride None
        Require all granted
    </Directory> 
    WSGIApplicationGroup %{GLOBAL}
</VirtualHost>

WebB.conf:

<VirtualHost *:80>
    ServerName webb.com
    ServerAlias www.webb.com
    ServerAdmin [email protected]

    DocumentRoot /srv/apps/webb/webb    
    WSGIScriptAlias / "/srv/apps/webb/webb/webb/wsgi.py"

    ErrorLog /var/log/webb/error.log
    CustomLog /var/log/webb/custom.log combined

    <Directory /srv/apps/webb/>
        Options Indexes FollowSymLinks
        AllowOverride None
        Require all granted
    </Directory>    

    Alias /static /srv/apps/webb/webb/static
    <Directory /srv/apps/webb/webb/static>
        Require all granted
    </Directory>

    WSGIApplicationGroup %{GLOBAL}
</VirtualHost>

/etc/hosts:

127.0.0.1       localhost
127.0.1.1       localhost
127.0.0.1       weba.com webb.com

::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

Apache Version:

Problem:

The issue is that sometimes when I make a request to WebB, WebA is served, but after 3-5 page refreshes, WebB is served as requested. I've tried cleaning browser cache, using different devices, playing with the configs but couldn't find what the problem is. I also Looked at error logs to see if there is any issue, but couldn't find any.

Can anyone tell me why does these two web apps conflicts.