Simply prevent duplicate submissions by blocking the submit button while submitting
More Plugins
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Events Made Easy & qTranslate-X
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Varnish/Nginx Proxy Caching
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SeeMax Resizable Editor Sidebar
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Advanced Custom Field: Shortcode Field
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CiviCRM Member Sync
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Payment Gateway for WooCommerce with Stripe – by Pay Addons
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Block Metrics – Animated State Counter
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Show Current Template – CTI
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Admin Page Notes
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Lite Google Map
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CL WP Info
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Backend Google Translate
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Lead Sync – WPForms to Jetpack CRM
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WPkmkz Bootstrap Grid Widgets
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Products Coming Soon for WooCommerce
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Sortable Posts
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Data Source for Contact Form 7
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TicketMachine Event Manager & Calendar
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SVG Safe Uploads
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Editor Blocks for Gutenberg